385501681 has 2 divisors, whose sum is σ = 385501682. Its totient is φ = 385501680.

The previous prime is 385501667. The next prime is 385501703. The reversal of 385501681 is 186105583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259725456 + 125776225 = 16116^2 + 11215^2 .

It is a cyclic number.

It is not a de Polignac number, because 385501681 - 2⁹ = 385501169 is a prime.

It is a super-2 number, since 2×385501681² = 297223092107651522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 385501681.

It is not a weakly prime, because it can be changed into another prime (385501651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192750840 + 192750841.

It is an arithmetic number, because the mean of its divisors is an integer number (192750841).

Almost surely, 2^385501681 is an apocalyptic number.

It is an amenable number.

385501681 is a deficient number, since it is larger than the sum of its proper divisors (1).

385501681 is an equidigital number, since it uses as much as digits as its factorization.

385501681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 385501681 is about 19634.1967240832. The cubic root of 385501681 is about 727.7944823252.

The spelling of 385501681 in words is "three hundred eighty-five million, five hundred one thousand, six hundred eighty-one".